This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX125S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI100 Standard Cylinder SI100BX125S
The AirTAC Airtac SI100 Standard Cylinder SI100BX125S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX125S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX125S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI100 Standard Cylinder SI100BX125S
The AirTAC SI100BX125S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 125mm stroke. It delivers 3927N push and 3681N pull at 0.5MPa via a G1/2 port. The direct replacement is the SAI100BX125S, which matches the interface, force, and stroke. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. This -B variant uses a SUS304 stainless piston rod for corrosion resistance, and the -S magnet works with legacy CS1-B/DS1-B sensors.
The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Note that a standard cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock or the SAIL/BSAI variant.
Airtac SI100 Standard Cylinder SI100BX125S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX125S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX125S |
| Bore size | Ø100 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100BX125S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100BX125S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100BX125S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI100 Standard Cylinder SI100BX125S Is Used
Press Fit Assembly
Drives heavy-duty bushings and bearings into automotive housings, utilizing the 3927N push force at 0.5MPa to seat components reliably.
Stainless Forming
Actuates forming dies in humid washdown environments, leveraging the SUS304 rod option to prevent corrosion and ensure smooth operation.
Replacing the Airtac SI100 Standard Cylinder SI100BX125S with the SAI100BX125S
To replace the discontinued SI100BX125S, order the SAI100BX125S. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the 100mm bore, 125mm stroke, G1/2 port, and M20x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and that the -S magnet is specified for current AirTAC switches. The -B rod is SUS304 stainless steel; default is carbon steel. If sizing down, an 80mm bore yields 2513N push at 0.5MPa; sizing up to 125mm provides 6136N. For load holding without live air, the cushion will not lock the piston—specify an external pilot check valve or the SAIL/BSAI lock variant. Since the stroke is 125mm, standard guide rules apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX125S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100BX125S FAQ
Yes, the AirTAC SI100BX125S is discontinued. The direct replacement is the SAI100BX125S. It features the same ISO 15552 mounting interface, 100mm bore, 125mm stroke, output force, and G1/2 port, dropping directly into existing fixtures.
This double-acting cylinder has a G1/2 port. The thrust ratings are 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical maximum force of 801kgf at 1.0MPa. The operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX125S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX125S replacement — usually within 7-8 hours.